Harrison ade his first-class debut at Lord’s in 2004 when he was included in the MCC side to face county champions Sussex.
The pace bowler was included after the withdrawal of Lancashire’s Sajid Mahmood and he celebrated by taking the early wicket of former England batsman Ian Ward.
He had made his Glamorgan first-team debut two years earlier when he featured in the nine-wicket one-day win against Scotland at Sophia Gardens.
Harrison did not make an appearance for Glamorgan during 2004 but his potential was recognised during the following winter when he agreed a new three-year contract to keep him at the county until 2007.
Earlier in his career, he represented West of England Under-13s and Under 15s and went on tour to the West Indies.
He has also played for England at U15 and 17 level and was part of the squad that reached the semi-finals of the Under 19 World Cup in 2004.
Harrison retained his place in the squad for the tour of Malaysia and India at the start of 2005 but could not prevent a 3-0 defeat in the Test series and a 4-1 defeat in the one-day internationals.
He is the younger brother of fellow Glamorgan pace bowler David Harrison. The pair are from a family of cricketers with his father Stuart also representing the Welsh county during the 1970’s.
Glamorgan released Adam after he made just two apperances in the 2007 season.